Question

Which substance serves as a reducing agent in the following
reaction ? [1994]
14H⁺ + Cr₂O₇²⁻ + 3Ni →
2Cr³⁺ + 7H₂O + 3Ni²⁺
(a) H₂O (b) Ni
(c) H⁺ (d) Cr₂O₇²⁻

Answer 1

answer : option (b) Ni

A reducing agent is an element or species which loses it electrons and oxidize itself. while oxidizing agent gains electrons and reduce itself.

let's check which one follow definition of reducing agent.

14H⁺ + Cr₂O₇²⁻ + 3Ni → 2Cr³⁺ + 7H₂O + 3Ni²⁺

here Ni lose its electron and becomes Ni²+ as you see. it is oxidised and reduced H+ into H2O.

so, Ni is reducing agent in the given reaction.

hence, option (b) is correct choice.

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Which of the following behaves as both oxidising and reducing agents ?

(a) H₂SO₄

(b) SO₂

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